something tought to be a heli move forward and shoot back wards in a blink of a eye

me and my dad my mom where on vacation in florida over my aunts house when we all whent in the pool and swam and i looked in the sky and i said dad look a helicopter and my mom looked also and it had weird lights in a triangle shape with a thin layer of blacknes around it wich could have been the edge of it sence it was at night and most ufos are shiny that most have been it but we continued to stair at it for a few more seconds and then bam the thing hammerd backward from the direction it came and was gone.